The way Trump talks may make him seem like an outlier in American politics but a new study in PNAS argues he's actually the culmination of a presidential trend that began in 1900. Over the years presidential speeches have shown a consistent decline in analytical thinking and a rise in confidence.

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The way Trump talks may make him seem like an outlier in American politics but a new study in PNAS argues he's actually the culmination of a presidential trend that began in 1900. Over the years presidential speeches have shown a consistent decline in analytical thinking and a rise in confidence.